Changes

* '''Best practises''': -> FAQ

* '''Tools''': title is too vague. People look for specific things, like explorers, miners, wallets. We should focus on those as main pages

* <del>'''Raspberry node''': Amazing! (i'm biased ;)) -> guides</del>

* <del>'''Legal''': -> Exchanges - (mapple) I think this can just be removed from main menu - there's already a link to the document in https://raven.wiki/wiki/Exchange#Is_Ravencoin_a_security.</del> (jeroz) '''I AGREE. Done :)'''